2015-04-08_REPORT - C1994082 - Laserfiche WebLink

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regulated by mercury limits; they are just required to be reported. Please note: Spring YSSPG2 had an ammonia (as nitrogen) level of 0.24 mg/l. Table 13 states that the standard for the Yampa segment 13e is 0.05 mg/l. This should be watched to see if a trend develops. Also YSG5 had exceeded the Table 13 value for Nitrite. The lab value was 1.46 mg/1 (Oct. 2013) and 0.23 mg/1 (June 2014), the standard is listed as 0.05 mg/l. This should be watched to see if a trend develops. 10. Interim Narrative CQWCC regulation 41 The manganese standard of 0.2 mg/1 Standard for ( CWQCC reg. 41) was exceeded four Groundwater. times by two locations. This may be due to recharge from a spoil aquifer, high manganese values are common at Yoast due to the alkaline soil type of the site. 10 mg/1 limit determined by the EPA would be more suitable than the 0.2mg/1 for acidic soils not found at the mine site. YW30 had two exceedances in the same sample, one for cadmium and the other for lead. This was thought to be caused by the laboratory diluting the sample prior to analysis. This was done to reduce the effects of interferences on the sample. YWCU33 and YWC33 both exceeded the fluoride limit twice. These two sites historically exhibit high fluoride values due to the water being of the bicarbonate type. These sites also exhibit high pH levels. YWCU33 exceeded the pH limit once during the 2014 water year. 11. Sampling frequency Tab 15, Table 15 -9 of The report indicated that all of the at surface water sites. CDRMS mining permit sampling frequencies were met. C- 1994 -082 12. Parameters to be Tab 15, Table 15 -4 and The parameters to be sampled are: sampled at surface 15 -5 of CDRMS mining conductivity (umhos /cm), pH (units), water sites. permit C -1994 -082 temperature (C), total recoverable iron (mg/1), dissolved manganese